Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c80602708f72388…

MALICIOUS

PDF

74.1 KB Created: 2021-06-07 23:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 172845b01b570213ea4e3177390c0398 SHA-1: aec3929af4dde38cee54b362ca14bf99233b2db7 SHA-256: 1c80602708f723886b3e2f812c0a152f67942c86e8a9ad9ca059385ff7600fdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns. No scripts were extracted, but the presence of external URIs and compromised hosting points to a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=reading+comprehension+test+for+grade+8+with+answers+pdf PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9e5f3f98---bozikeloxuvomesomotufes.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vov9op4ha8hr193sqqvi05p2h6/zupepujoz.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/lunotoketenapuvixesowareb.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b488ccb4f---godojiwovunoxinisaxov.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/6af80f4ff44cab603fc4ea67a9e853fe/25188761519.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6ff5151f741b47f4212200996e6f6392/lavozizudowatamuwikunej.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/42742692617.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f06b641931---95350584700.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c4bd7cd2---mobederosim.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/68156683113.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/26748062538.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/036n6rrmt4v1f2npdmc8g62eno/65221506731.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/44304039530.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/revobadejimez.pdfIn PDF document text
    • https://majubesar.info/contents//files/71683673885.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e355c13233---76451835452.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/3196377613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 5832 bytes
SHA-256: 47c75347179c6b1aa3f7368e1d884fd831649b9ff7c5316c223fb039b5dea50f
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 10516 bytes
SHA-256: ad1cf7c78a55e5b6dc60c3a7e335f97fe7d2ebb4b6b3ee471076ee500f68ab16